let name="yushi",
	key={
	  a:1,
		b:2
	},
	add=(a,b)=>{
	  return a+b;
	},
	map=new Map;
map.set(name,key)
map.set(add,add)
console.log(map)
console.log(map.size)
console.log(map.has(name))
console.log(map.get(name))
console.log(map.keys())
console.log(map.values())
